WO2008001238A2 - Élément de détection permettant d' établir un diagnostic concernant une structure multicouche - Google Patents

Élément de détection permettant d' établir un diagnostic concernant une structure multicouche Download PDF

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Publication number
WO2008001238A2
WO2008001238A2 PCT/IB2007/051970 IB2007051970W WO2008001238A2 WO 2008001238 A2 WO2008001238 A2 WO 2008001238A2 IB 2007051970 W IB2007051970 W IB 2007051970W WO 2008001238 A2 WO2008001238 A2 WO 2008001238A2
Authority
WO
WIPO (PCT)
Prior art keywords
sensor element
substrate
multilayer structure
circuit
fabric
Prior art date
Application number
PCT/IB2007/051970
Other languages
English (en)
Other versions
WO2008001238A3 (fr
Inventor
Giuliano Balbi
Giacomo Manenti
Original Assignee
New Componit S.R.L.
Suntech S.R.L.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by New Componit S.R.L., Suntech S.R.L. filed Critical New Componit S.R.L.
Publication of WO2008001238A2 publication Critical patent/WO2008001238A2/fr
Publication of WO2008001238A3 publication Critical patent/WO2008001238A3/fr

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N19/00—Investigating materials by mechanical methods
    • G01N19/08—Detecting presence of flaws or irregularities

Definitions

  • the present invention relates to a sensor element for the diagnostic of a multilayer structure subject to an action of physical deterioration.
  • the invention also relates to a multilayer structure for a fabric joint comprising said diagnostic sensor.
  • the various types of compensators include fabric compensators, also called fabric joints, which are extensively applied, for example, in thermoelectric power plants, discharge channels of gas turbines or industrial furnaces, in the chemical and petrochemical industry, in paper mills, foundries, cement works and in various other industrial contexts.
  • the traditional fabric joints comprise a multilayer structure which is usually characterised by a high chemical inertia and a high resistance to corrosion vis-a-vis the fluids that run inside the ducts connected by the joint. At the same time this multilayer structure is impermeable to fluids so as to prevent their leakage to the outside.
  • the structure in question comprises one or more inner layers made of wire mesh and/or fibreglass and one or more outer layers made of polymer, for example PTFE.
  • the inner layers make the structure of the joint resistant to corrosion, while the outer layers ensure impermeability to fluids.
  • the main aim of the present invention is to provide a sensor element for the diagnostic of a multilayer structure subject to an action of physical deterioration.
  • one object of the present invention is to provide a sensor element that signals the state of deterioration of a multilayer structure to permit programming of the repair or replacement of the structure.
  • a further object of the present invention is to provide a sensor element made of a reduced number of components that can be easily assembled via known industrial processes at low cost.
  • a further object of the present invention is to provide a sensor element that is highly dependable and easy to produce at competitive costs.
  • a sensor element for the diagnosis of a multilayer structure subject to an action of physical deterioration characterised in that it comprises a substrate made of insulating material on which a circuit is applied, made of conductive material. Said circuit being suitable to be crossed by an electric signal and to be connected to signalling means.
  • the sensor element according to the invention is operatively located inside the multilayer structure so as to be sensitive to the effects of the deterioration action on the structure. Said action causes a variation in the electric signal which is appropriately amplified by the signalling means to inform the operators of the state of deterioration of the structure and, if necessary, the extent of said deterioration.
  • the sensor element has an extremely simple structure which can be produced via low cost production processes.
  • the information provided by the sensor element allows the operators to programme the operations for repair or replacement of the joint together with the routine maintenance operations with obvious advantages in terms of overall running costs.
  • figure 1 is a schematic view of a sensor element according to the present invention
  • FIG. 2 is a schematic view of a first embodiment of a multilayer structure comprising a sensor element according to the present invention
  • FIG. 3 is a schematic view of a second embodiment of a multilayer structure comprising a sensor element according to the present invention.
  • FIG. 4 and 5 are schematic views of a fabric joint having a multilayer structure provided with at least one sensor element according to the present invention.
  • the sensor element 1 is used for the diagnosis of a multilayer structure 2 subject to an action of physical deterioration.
  • the sensor element 1 in a multilayer structure 2 of a fabric joint 3, but it is understood that the sensor element 1 can be applied in any other conceptually equivalent situation or in the event of a diagnosis element being required to define the state of physical deterioration of a multilayer containment structure.
  • action of physical deterioration refers to all those actions of corrosion, deterioration or disaggregation that occur in the multilayer structure 2 due to chemical-physical aggression of the fluids contained by the structure.
  • the sensor element 1 comprises a substrate made of insulating material 10 on which a circuit is applied made of conductive material 15 which will be crossed by an electric control signal.
  • the circuit made of conductive material will be electrically connected to signalling means 16 which have the purpose of amplifying and signalling any variations in the electric signal characteristic of the state of deterioration reached by the multilayer structure 2 to which the sensor element 1 is applied.
  • signalling means 16 which have the purpose of amplifying and signalling any variations in the electric signal characteristic of the state of deterioration reached by the multilayer structure 2 to which the sensor element 1 is applied.
  • the sensor element is positioned like a layer of the structure, thus constituting a "sensor layer".
  • the action of physical deterioration deteriorates the structure 2, wearing and/or perforating the inner layers (indicated in figure 2 by references 7A, 7B and 7C) until it causes physical alterations of the circuit made of conductive material 15 applied on the substrate made of insulating material 10.
  • Said physical alterations can consist, for example, in physical breakage of the circuit due to perforation of the substrate 10.
  • Said breakage of the circuit obviously causes a variation in the electric control signal which, once processed by the signalling means 16, translates into information for the operator on the state of progress of the damage in the structure 2 with respect to the pre-set position in which the sensor element 1 is located.
  • the conductive material can be metallic or non-metallic.
  • the substrate 10 can be made of insulating materials of different type, for example those traditionally used in the manufacture of fabric joints. These materials comprise, for example, vitreous-based fabrics (for example fibreglass or silica fibre fabrics), Teflon glass fabrics, needle felt, fluorinated polymer (for example PTFE used in the multilayer structures of fabric joints for production of the outer containment layers indicated in figure 2 by references 8 A and 8B).
  • the substrate 10 is formed of a polyimide film.
  • the insulating substrate 10 can consist of a laminate formed by a polymer film coupled with a film made of another insulating material.
  • a possible structure of a laminate can comprise a polyester film coupled with a film of organic/inorganic paper.
  • the laminate could comprise, for example, a polyester film coupled with non-woven fabric.
  • the substrate 10 can be made of all the insulating materials suitable for the application of the present invention.
  • the electrical circuit applied on the film directly detects the deterioration action and signals, via the relative signalling means 16, perforation of the insulating substrate 10 of the sensor element 1.
  • the response times of the latter are determined by the dielectric constant of the material used for construction of the insulating substrate 10. Therefore, by increasing or reducing the thickness of the substrate 10, the material being equal, it is possible to select different response times for the sensor element 1. Analogously, the thickness of the substrate 10 being equal, the response times can be varied by varying the nature of the insulating material or the dielectric constant of the substrate.
  • the substrate 10 can be made of PTFE for example or alternatively of a layer of fibreglass-based fabric with dielectric constant superior to that of the Kapton®.
  • the conductive material used for the electric circuit can be a metallic material, for example the traditional copper, or a non-metallic material, especially if polyimide films are used as insulating substrates.
  • the conductive circuit 15 can consist, for example, of a lamina made of aluminium, copper or other metal applied on the insulating substrate 10.
  • the circuits 15 applied on the substrate 10 can be made of one or more conductor wires applied so as to define a circuit for the control signal.
  • the circuit can also be formed of a wire mesh, for example made of stainless steel, such as the reinforcement mesh normally used to contain the layers of padding in a fabric joint.
  • a polyimide film is used as insulating substrate 10, for the electric circuit 15 the use of conductive pastes or inks, preferably graphite-based, has proved particularly suitable; these are already used in the electronics sector (in particular in the production of printed circuits) such as, for example, those sold by Coates Leurilleux S.p.A. under the name "PCT” and/or the inks sold by the same company under the name "XZ250".
  • Application of the conductive material on the insulating film 10 can be advantageously performed according to the methods described in the patent application PCT/EP03/05743.
  • the variation in the electric signal is advantageously exploited also to define the extent of the structural damage in addition to the position thereof.
  • the variation in the electric signal identifies, for example, not only the layer or layers of the structure that have been perforated but also the extent of said perforation. If for example a lamina of conductive material (aluminium, copper or other material) is applied to the insulating substrate 10, it is possible to diagnose the entity of the laceration on the conductive sheet via the known Ohm's law.
  • the metallic sheet has an ohmic value established by its physical characteristics (dimensions and resistivity of the metal used).
  • the present invention also relates to a multilayer structure 2 which is characterised in that it comprises at least one sensor element 1 according to the present invention.
  • a multilayer structure 2 which is characterised in that it comprises at least one sensor element 1 according to the present invention.
  • figures 2 and 3 illustrate possible embodiments of said structures in order to highlight the advantages relative to use of the sensor element 1.
  • the sensor element 1 according to the invention can be applied to any multilayer structure already known, above all in the field of fabric joints for industrial plants.
  • the sensor element 1 is arranged in a pre-established position inside the multilayer structure 2 so as to be located between one or more outer layers 8A and 8B made of material impermeable to fluids and one or more inner layers 7A, 7B, 7C, 7D and 7E made of material resistant to corrosion.
  • the outer layers 8A and 8B therefore have the function of containing the fluid, while the inner ones 7A, 7B, 7C and 7E oppose the chemical-physical aggression of the fluid, preserving the functionality of the outer layers 8 A and 8B.
  • the function of the sensor element 1 is therefore that of constituting a "sensor layer" which signals to the operators, via the signalling means 16 outside the structure, the state of deterioration of the inner layers 7A, 7B, 7C and 7E of the structure 2 before the damage affects the outer containment layers 8 A and 8B.
  • the fluid is contained by the presence of a layer 8A made of fluorinated polymer, preferably in PTFE, and by a layer of Teflon glass fabric which constitutes the outermost layer of the structure 2.
  • the resistance to corrosion is provided by at least one more internal layer of wire mesh and one or more layers of fibreglass in the form of glass fabric or needle felt.
  • the innermost layer 7A of the structure 2 consists of a layer of stainless steel mesh, while a second layer 7B adjacent to the first 7A is made of glass fabric.
  • a third layer 7C adjacent to the second consists of fibreglass needle felt while the sensor element 1 is arranged between this third layer 7C and a fourth layer 7D also consisting of fibreglass needle felt.
  • the multilayer structure 2 schematically illustrated in figure 3 differs from the one of figure 2 due to the presence of an inner layer 7E made of silica fabric and another silica fibre layer arranged between the innermost layer 7A made of wire mesh and the fibreglass layer 7B adjacent to the sensor element 1.
  • This further layer increases resistance to chemical-physical aggression, allowing the structure 2 to operate in harsher conditions than that of figure 2.
  • the structures described are to be considered simply examples of multilayer structures 2 to which the sensor element 1 can be applied according to the present invention.
  • the sensor element 1 is suitable for application to a virtually indefinite number of multilayer structures 2 having different composition according to the application for which they are intended.
  • the present invention also relates to a fabric joint 3 characterised in that it comprises a multilayer structure 2 to which a sensor element 1 is applied according to the above description.
  • the sensor element 1 is shown by a broken line to further highlight its operating position within the multilayer structure 2.
  • the signalling means 16 are obviously located in a position external to the structure 2 to interface with the operators.
  • the signalling means can comprise a signal control unit which can be connected via GPS or GSM systems to an ordinary mobile phone or to another remote user interface means.
  • the fabric joint 3 is defined not only by the multilayer structure 2 but at times also by a pair of end flanges 50 which permit mechanical connection of the joint 3 to two ducts for the passage of a fluid. It is understood that the joint 3 can take different forms, for example distinguished by a cylindrical, square or elliptic cross section, just as the connection flanges can in certain situations be absent.
  • the sensor elements 1 could be arranged to increase the amount of information available to the operators.
  • the sensor elements 1 can be inserted at different levels of the structure 2, but can also be inserted at the same level at different points.
  • the elements 1 could be arranged at the same level but separate from one another so that each of them operatively controls the conditions of one side of the cross section of the joint.
  • the use of a plurality of sensor elements 1 allows the operators to establish more accurately the evolution of the internal damage of the structure 2, thus facilitating programming of maintenance work.
  • the technical solutions adopted for the sensor element provide for full achievement of the pre-established aims and objects.
  • the sensor element has an extremely simple configuration which permits use in a large number of applications.
  • the sensor element is at the same time dependable and easy to produce via known low-cost industrial processes.

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  • General Health & Medical Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
  • Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)

Abstract

L'invention concerne un élément de détection permettant d'établir un diagnostic concernant une structure multicouche (2) soumise à une détérioration physique. Cet élément de détection (1) comprend principalement un substrat qui est constitué d'un matériau isolant (10), par exemple un polyimide, sur lequel est appliqué un circuit (15). Ce circuit (15) est constitué d'un matériau conducteur, par exemple une encre conductrice conçue pour être parcourue par un signal électrique et reliée à des moyens de signalisation. La présente invention se rapporte en outre à une structure multicouche (2) pour un joint structuré comprenant ledit élément de détection (1).
PCT/IB2007/051970 2006-05-26 2007-05-24 Élément de détection permettant d' établir un diagnostic concernant une structure multicouche WO2008001238A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITBG20060025 ITBG20060025A1 (it) 2006-05-26 2006-05-26 Elemento sensore per la diagnostica di una struttura multistrato sottoposta ad una azione di degrado fisico
ITBG2006A000025 2006-05-26

Publications (2)

Publication Number Publication Date
WO2008001238A2 true WO2008001238A2 (fr) 2008-01-03
WO2008001238A3 WO2008001238A3 (fr) 2008-04-17

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2007/051970 WO2008001238A2 (fr) 2006-05-26 2007-05-24 Élément de détection permettant d' établir un diagnostic concernant une structure multicouche

Country Status (2)

Country Link
IT (1) ITBG20060025A1 (fr)
WO (1) WO2008001238A2 (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010004418A1 (fr) * 2008-07-09 2010-01-14 Eaton Corporation Tuyau à capacité de détection de défaut
US9435709B2 (en) 2011-04-29 2016-09-06 Eaton Corporation Degradation monitoring system for hose assembly
US9535024B2 (en) 2012-09-14 2017-01-03 Eaton Corporation Sense and hold circuit for hose assembly
US9562822B2 (en) 2013-02-22 2017-02-07 Eaton Corporation Flexible contact arrangement for hose assembly
US9581629B2 (en) 2010-05-12 2017-02-28 Parker Hannifin Corporation Sensor sleeve for health monitoring of an article
US9643550B2 (en) 2013-03-15 2017-05-09 Eaton Corporation Hose voltage carrier
US9677967B2 (en) 2010-11-22 2017-06-13 Eaton Corporation Pressure-sensing hose
US9952170B2 (en) 2012-04-23 2018-04-24 Eaton Intelligent Power Limited Methods and systems for measuring hose resistance
US10024465B2 (en) 2012-11-22 2018-07-17 Eaton Intelligent Power Limited Energy harvesting circuit for life-sensing hose assembly
US10527205B2 (en) 2012-09-14 2020-01-07 Eaton Intelligent Power Limited Wave contact arrangement for hose assembly

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2299636A (en) * 1995-04-05 1996-10-09 Norrismount Investment Limited An expansion joint
JPH08277978A (ja) * 1995-03-31 1996-10-22 Nichias Corp フレキシブルジョイント
US6386237B1 (en) * 1999-04-12 2002-05-14 The Goodyear Tire & Rubber Company Abrasive material transport hose with wear detecting sensors
FR2847342A1 (fr) * 2002-11-14 2004-05-21 Pcm Pompes Procede et agencement de detection de l'integrite d'un tube elastiquement deformable, et application aux pompes peristaltiques
DE20320534U1 (de) * 2003-03-27 2004-09-23 Korema Gmbh & Co. Kg Weichstoffkompensator

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08277978A (ja) * 1995-03-31 1996-10-22 Nichias Corp フレキシブルジョイント
GB2299636A (en) * 1995-04-05 1996-10-09 Norrismount Investment Limited An expansion joint
US6386237B1 (en) * 1999-04-12 2002-05-14 The Goodyear Tire & Rubber Company Abrasive material transport hose with wear detecting sensors
FR2847342A1 (fr) * 2002-11-14 2004-05-21 Pcm Pompes Procede et agencement de detection de l'integrite d'un tube elastiquement deformable, et application aux pompes peristaltiques
DE20320534U1 (de) * 2003-03-27 2004-09-23 Korema Gmbh & Co. Kg Weichstoffkompensator

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8183872B2 (en) 2008-07-09 2012-05-22 Eaton Corporation Hose with fault detection capability
AU2009269684B2 (en) * 2008-07-09 2013-07-25 Danfoss A/S Hose with fault detection capability
KR101604153B1 (ko) 2008-07-09 2016-03-16 이턴 코포레이션 고장 검출 능력을 구비한 호스
WO2010004418A1 (fr) * 2008-07-09 2010-01-14 Eaton Corporation Tuyau à capacité de détection de défaut
US9581629B2 (en) 2010-05-12 2017-02-28 Parker Hannifin Corporation Sensor sleeve for health monitoring of an article
US9677967B2 (en) 2010-11-22 2017-06-13 Eaton Corporation Pressure-sensing hose
US9435709B2 (en) 2011-04-29 2016-09-06 Eaton Corporation Degradation monitoring system for hose assembly
US9952170B2 (en) 2012-04-23 2018-04-24 Eaton Intelligent Power Limited Methods and systems for measuring hose resistance
US9535024B2 (en) 2012-09-14 2017-01-03 Eaton Corporation Sense and hold circuit for hose assembly
US10527205B2 (en) 2012-09-14 2020-01-07 Eaton Intelligent Power Limited Wave contact arrangement for hose assembly
US10024465B2 (en) 2012-11-22 2018-07-17 Eaton Intelligent Power Limited Energy harvesting circuit for life-sensing hose assembly
US9562822B2 (en) 2013-02-22 2017-02-07 Eaton Corporation Flexible contact arrangement for hose assembly
US9643550B2 (en) 2013-03-15 2017-05-09 Eaton Corporation Hose voltage carrier

Also Published As

Publication number Publication date
ITBG20060025A1 (it) 2007-11-27
WO2008001238A3 (fr) 2008-04-17

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